Bottom bird appears to be a molting juvenile. This race is endemic to the central Ryukyu islands including Okinawa. This individual shows loose hair-like feathers on its nape, characteristic of the Bulbul family (Pycnonotidae). Brown-eared Bulbul is sometimes placed in the genus Microscelis (e.g.Brazil 2009) and sometimes in the genus Ixos. The latest version of the Clements checklist reverts the genus to Hypsipetes following recommendations by Oliveros & Moyle (2010). Up to 14 subspecies have been recognized with northern birds being larger and grayer and southern populations (mostly on small islands) being smaller and browner.
References:
Brazil, M.A. (1991) The Birds of Japan. Smithsonian Inst. Press.
Brazil, M. 2009. Birds of East Asia. Princeton Univ. Press.
Fishpool, L. & Tobias, J. (2017). Brown-eared Bulbul (Hypsipetes amaurotis). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from http://www.hbw.com/node/58035 on 21 June 2017).
Oliveros, C.H. & Moyle, R.G. (2010) Origin and diversification of Philippine bulbuls. Mol. Phylogenet. Evol. 54(3): 822ñ832.